Onion Knight Card Farming

There's surprisingly little information on this card. So I figured I would ask here.
From what I understand, there are three ways to get this card. Farm Syrcus Tower, Farm World of Darkness, and buy Mythril Packs. I'd rather farm, but I suppose it'll be good to have something to buy after I get Fenrir and Cloud. And Zidane.

Anyway, which has the higher drop rate? And what is the drop rate? I'm seeing many people say they have had quite a few drop, and I see many people say they never see it. So I'm torn.
And as to where it drops, I assume they're talking about World of Darkness. But it's not explicitly stated.

I got a few of them back when they were released, always via WoD.

Just go farming WoD and pretend you are farming for glamour just to make farming more enjoyable. I spammed WoD a lot these days for tank's demon set ._. Not to mention I got the card without realizing it. xD

The TT website says that another way to get it is from Lewana. Judging from the comments on the TT site, it's hard to get from any of these 4 places. I got it from WoD once when it first came out, but have never seen it drop since then.

You can get from Lewena. However you won't. She is ridiculously annoying to beat and even with well over 100 victories over her she has never dropped a single card.

I heard from many accounts that it was common from WoD. If that's not the case, I have more common cards to hunt anyway. I'll just try my luck at him after I get everything else via mythril packs.

Just got another one XD WoD is a great place to farm for Onion Knight, if you like raiding for poetics for anima that is :D

I dumped about 300k in mythril packs in celebration of getting a 40* chocobo, and ended up with 4 Onion Knights. Going to wager you'll get at least a few of them if you trying for the pack-exclusive cards.

So it seems like no matter which way I farm this card, it's not that hard to get. The packs seem more fun (I love the changes to the challenge log), so I'll go with that.
Thing is, I have the other cards that come from the packs. So in a way it's kind of a waste.

Congratulations on getting a perfect chocobo. Is this your last one?

I must have lucked out then... I only began playing in January and even though I have far exceeded iLvl for WoD I just did it for the first time the other day and got the card >.< Hang in there!